package com.example.demo5.servlet;

import com.example.demo4.Bean.Notice;
import com.example.demo4.dao.NoticeDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.List;

/**
 * 1.网址能够访问对当前的Java类
 * 2.能够接受网址传递来的参数
 * 3.能将修查询出来的数据传递给前端页面
 * 4.控制显示前端页面
 */
@WebServlet("/notice.jsp")
public class NoticeServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession session = req.getSession();
        String User = (String)session.getAttribute("user");
        if (User == null || User.equals("")) {
            resp.sendRedirect("Login.jsp");
            return;
        }
        String p=req.getParameter("page");
        int page=1;
        if(p != null && p.equals("")){ //页面字符串不为空,强制转换为数字
            page = Integer.parseInt(p);
        }
        NoticeDao noticeDao = new NoticeDao();
        int totalPage = noticeDao.countPage();
        List<Notice> notice = noticeDao.getList(page);
//        List<Notice> notice = noticeDao.getList(page);
        //传递新闻信息给前端页面
        req.setAttribute("notice",notice);
        req.setAttribute("currentPage",page);//当前页数
        req.setAttribute("totalPage",totalPage);//总页数
        //加载网络前端页面
        req.getRequestDispatcher("WEB-INF/notice.jsp").forward(req,resp);
    }
}
